I have observed the activities of Golden Horde and Ilkhanate (18 Nov beta patch), and it appears that they cannot make peace, or at least not on the first attempt. Several times I've seen them make peace with a nation, yet they continued to be in the state of war (sometimes making peace again only a few days later, only to continue being at war). Golden Horde had a Cuman ruler btw, so it isn't tied to Mongol culture. At other times, they successfully made peace and the war went away, so it seemed somewhat random.
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